Added UNIQUE constraint on STORAGE_CLASS_NAME and removed the the UNIQUE constraint on DISK_INSTANCE_NAME and STORAGE_CLASS_NAME

The retrieve request address is now stored in the EOS namespace as an extended attribute and deleted
after checks on cancellation. The cleanup of the queues will be eventually done by the tape servers.

The sleep time (15 minutes) is currently hardcoded, but implemented in a single place (OStoreDB::fetchMountInfo() ).

Moved the space reservation information to the DriveStatus object store object instead of a new central registry.
The central registry would have been a single point of contention as was the DriveRegistry before being split into
DriveStates. As the problem is so close to the one of the drive status, we can actually reuse the drive status for this purpose.

The algorithm will also change as we move the responsibility of querying the free space from the disk systems into the OStoreDb
object instead of the Scheduler. This leads to a slightly worth layering of responsibilities, making the OStoreDb::RetrieveMount
object a client of the disk::DiskSystemFreeSpaceList object.

The current implementation will also query the free space from the disk systems on each pop, instead of doing so in a globally
cached fashion. With the new model, we could cache the free space per drive (if needed), but not globally. This is not expected
to be a real issue and free space is a global counter in the disk system, expected to be readily available.

Added the ArchiveForRepack mountType to the Drive reporting
Transformed the DataTransferSession::mountTypeToString() to add the ArchiveForRepack mountType, transformed the normal "Archive" into "ArchiveForUser"

Update cta::Catalogue::tapeMountedForRetrieve and
cta::Catalogue::tapeMountedForArchive to increase read/write
mount counts.

Add isFromCastor field to the catalogue DB.

CTA only sets this filed to false and respects it in the getTapesForWriting

Implement catalogue createDiskSystem,
getAllDiskSystems, deleteDiskSystem methods.

tapes

Add read-only tape flag support in the catalogue for the TAPE table.
Add RdbmsCatalogue::setTapeReadOnly method to modify this flag with
  "cta-admin tape ch" command.
Add RdbmsCatalogue::setTapeReadOnlyOnError to set this flag from taped.
Add support for rdonly flag listing for "cta-admin tape ls" and
  "cta-admin sq" command.

Mostly changes to new unit tests.

The blob is a set of type/value pairs which can be serialised to a byte
array for storage in the DB.

Redundant as it is always the same as totalBytes

* TapeFile::compressedSize is renamed to fileSize
* TapeFileWritten::compressedSize is removed, as it contains the same
  information as TapeFileWritten::size

Mostly changes to new unit tests.

The blob is a set of type/value pairs which can be serialised to a byte
array for storage in the DB.

Redundant as it is always the same as totalBytes

* TapeFile::compressedSize is renamed to fileSize
* TapeFileWritten::compressedSize is removed, as it contains the same
  information as TapeFileWritten::size

cta-admin logicallibrary ls
cta-admin mountpolicy ls
cta-admin showqueues
cta-admin storageclass ls